<!DOCTYPE html>
<html>

<head>

<meta charset="UTF-8">

<title>Tangents - CodePen</title>

<link rel="stylesheet" href="css/style.css" media="screen" type="text/css" />

<script src="js/modernizr.js"></script>

</head>

<body>

<div class="about title">
	<h1>切线</h1>
	<button class="btn randomize">重新绘制</button>
</div>

<script src='js/dat.gui.min.js'></script>
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